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Finding the Fourth Proportional to 20,930.84, 28,889.48 and 11,983.48

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Solution

The fourth proportional to 20,930.84, 28,889.48 and 11,983.48 is: 16,540.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.84 : 28,889.48 = 11,983.48 : x
  2. Step 2: Convert to fraction form
    20,930.84/28,889.48 = 11,983.48/x
  3. Step 3: Cross multiply
    20,930.84x = 28,889.48 × 11,983.48
  4. Step 4: Simplify right side
    20,930.84x = 346,196,505.79
  5. Step 5: Solve for x
    x = 346,196,505.79/20,930.84
  6. Step 6: Final answer
    x = 16,540.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.